Display RSS feed in your GitHub Profile README

First, add flag comments to where you want in your document:

### Latest Posts
<!-- feed start -->
<!-- feed end -->

Then add following steps to your workflow:

steps:
  - uses: actions/checkout@v2
  - uses: sarisia/actions-readme-feed@v1
    with:
      url: 'https://note.sarisia.cc/index.xml'
      file: 'README.md'
  - run: |
      git config --global user.name "${{ github.actor }}"
      git config --global user.email "${{ github.actor }}@users.noreply.github.com"
      git add .
      git commit -m "docs: update feed" || true
      git push

The result looks like:

• Aug 21 - C.UTF-8 とは何だったのか
• Aug 17 - RSS フィードを GitHub プロフィールに表示する
• Aug 10 - fish スクリプトのデバッグ
• Aug 08 - Arch Linux Install Battle
• Aug 05 - Linuxbrew で emscripten を導入する

Examples below uses following RSS feed item:

<item>
  <title>Blog Post</title>
  <link>https://blog.example.com/blog-post</link>
  <pubDate>Sat, 05 Aug 2020 00:00:00 +0000</pubDate>
</item>

For details, see src/format.ts

You can padding variables with zeros or spaces.

• changed: Whether the document is changed while this actions's run. 1 if changed, 0 else.

• items: Raw feed entry from rssparser.

  [
    {
      "title":"C.UTF-8 とは何だったのか",
      "link":"https://note.sarisia.cc/entry/what-is-c-utf8/","pubDate":"Fri, 21 Aug 2020 00:00:00 +0000",
      "content":"TL;DR 全ての Linux ディス...",
      "guid":"https://note.sarisia.cc/entry/what-is-c-utf8/",
      "isoDate":"2020-08-21T00:00:00.000Z"
    },
    ...
  ]

• newlines: New lines inserted to the document specified as file. Lines are joined with \n.

  <!-- feed start -->
  - Aug 10 - [fish スクリプトのデバッグ](https://note.sarisia.cc/entry/debugging-fish-script/)
  - Aug 08 - [Arch Linux Install Battle](https://note.sarisia.cc/entry/arch-linux-install-battle/)
  - Aug 05 - [Linuxbrew で emscripten を導入する](https://note.sarisia.cc/entry/linuxbrew-emscripten/)
  - Jul 29 - [UWP アプリは localhost へ接続できない](https://note.sarisia.cc/entry/uwp-localhost/)
  - Jul 22 - [Linuxbrew で入れた Go でビルドしたバイナリは可搬性が無い](https://note.sarisia.cc/entry/linuxbrew-go/)
  <!-- feed end -->
  

• result: Result document with feed lines inserted. Lines are joined with \n

  # Actions Readme Feed
  
  Display RSS feed in your [GitHub Profile README](https://docs.github.com/en/github/setting-up-and-managing-your-github-profile/managing-your-profile-readme)
  ...
  

changed output can be used directly in the if conditional.

steps:
  - uses: sarisia/actions-readme-feed@v1
    id: feed
    with:
      url: 'https://blog.example.com/feed.xml'
      file: 'README.md'
  - if: ${{ steps.feed.outputs.changed == true }}
    run: echo "changed!"

Make your workflow with schedule trigger.

on:
  schedule:
    - cron: '0 */6 * * *'

jobs:
  readme:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - uses: sarisia/actions-readme-feed@v1
        id: feed
        with:
          url: 'https://note.sarisia.cc/index.xml'
          file: 'README.md'
      - if: ${{ steps.feed.outputs.changed == true }}
        run: |
          git config --global user.name "${{ github.actor }}"
          git config --global user.email "${{ github.actor }}@users.noreply.github.com"
          git add .
          git commit -m "docs: update feed"
          git push

Not only Qiita, you can use any RSS feeds that rss-parser supports.

- uses: sarisia/actions-readme-feed@v1
  with:
    url: 'https://qiita.com/sarisia/feed'
    file: 'README.md'

• Aug 24 - GitHubプロフィールにブログやQiitaの最新記事を表示する
• Jul 07 - ローカルでも CI でも使える卒論ビルド環境
• Jun 21 - Go Module Mirror から壊れたパッケージが落ちてくる
• Jun 06 - WSL2 Docker が PC のディスクを圧迫する

Make sure to change start_flag and end_flag for each feed.

- name: blog
  uses: sarisia/actions-readme-feed@v1
  with:
    url: 'https://note.sarisia.cc/index.xml'
    file: 'README.md'
    start_flag: "<!-- blog start -->"
    end_flag: "<!-- blog end -->"
- name: qiita
  uses: sarisia/actions-readme-feed@v1
  with:
    url: 'https://qiita.com/sarisia/feed'
    file: 'README.md'
    start_flag: "<!-- qiita start -->"
    end_flag: "<!-- qiita end -->"

### Blog
<!-- blog start -->
<!-- blog end -->

### Qiita
<!-- qiita start -->
<!-- qiita end -->

Setting locale option is not working correctly due to the limitation of Node.js shipped with GitHub Actions runner. I'm investigating this issue.

timezone seems working correctly.